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【单选题】
对二从1开始进行连续编号，要求每个结点的编号大于其左右孩子的编号，同一结点的左右孩子中，其左孩子的编号小于其右孩子的编号，则可采用(6)次序的遍历实现编号。A.
先序
B.
中序
C.
后序
D.
从根开始的层次遍历
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反馈参考答案：
举一反三
【简答题】越来越多的酒店在国际空港设置 ,使店外迎接服务更具专业化。
【单选题】She managed to save _____ she could out of her wages to help her brother.
A.
how little money
B.
so little money
C.
such little money
D.
what little money
【简答题】A.She hired a detective to help her. B.She finished writing only half of her story. C.She wants to put her book away. D.She s reading something interesting.
【单选题】Busy as she was, she made ______ her duty to help her old neighbors.
A.
this
B.
that
C.
one
D.
it
【简答题】We should help her when she is____________
【单选题】She ________ when she received her medical report.
A.
could help but to cry
B.
couldn’t help but crying
C.
couldn’t help crying
D.
couldn’t help to cry
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